Heat the olive oil in a large pan. Add the onion, garlic, ginger and chilli. Stir for 5 mins. Add the chickpeas with a splash of water, plus the cumin, turmeric, garam masala, salt and pepper. Cook for 5 more mins. Add the tomatoes and cook for 2 mins to soften. Remove from the heat. Mix in the rocket and wilt. Servie with a couple of spoonfuls of natural yogurt.